Utility knife



FIG. 1 is a perspective view of a utility knife showing my new design;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a ride side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof. 

The ornamental design for a utility knife, as shown. 